Publications de Manuel Guizar Sicairos

Publications associées (21)

Dynamic sparse x-ray nanotomography reveals ionomer hydration mechanism in polymer electrolyte fuel-cell catalyst

Tomographic imaging of time-evolving samples is a challenging yet important task for various research fields. At the nanoscale, current approaches face limitations of measurement speed or resolution due to lengthy acquisitions. We developed a dynamic nanot ...

AMER ASSOC ADVANCEMENT SCIENCE2024

Scanning Small-Angle X-ray Scattering of Injection-Molded Polymers: Anisotropic Structure and Mechanical Properties of Low-Density Polyethylene

Marianne Liebi, Manuel Guizar Sicairos

Injection molding is known to create a layered anisotropicmorphologyacross the sample thickness due to varying shear and cooling ratesduring the manufacturing process. In this study, scanning small-angleX-ray scattering was used to visualize and quantify t ...

AMER CHEMICAL SOC2023

Three-dimensional imaging of integrated circuits with macro- to nanoscale zoom

Gabriel Aeppli, Manuel Guizar Sicairos

The imaging of integrated circuits across different length scales is required for failure analysis, design validation and quality control. At present, such inspection is accomplished using a hierarchy of different probes, from optical microscopy on the mil ...

NATURE PUBLISHING GROUP2019

Single-shot x-ray ptychography as a structured illumination method

Manuel Guizar Sicairos

Single-shot ptychography is a quantitative phase imaging method wherein overlapping beams of light arranged in a grid pattern simultaneously illuminate a sample, allowing a full ptychographic dataset to be collected in a single shot. It is primarily used a ...

Optica Publishing Group2025

Microporous transport layers facilitating low iridium loadings in polymer electrolyte water electrolysis

Manuel Guizar Sicairos

Minimizing the power-specific iridium loading in polymer electrolyte water electrolysis (PEWE) is essential for the commercialization and upscaling of this technology. However, decreasing the iridium loading can severely affect performance and stability. M ...

ROYAL SOC CHEMISTRY2024

Experimental comparison of X-ray ptychographic and holographic nanotomography of metal-stained neuronal tissue

Manuel Guizar Sicairos

Hard X-ray nanotomography is a promising technology for nondestructive imaging of biological tissues with three-dimensional isotropic resolution. The implementation of fourth-generation synchrotron sources brings coherent X-ray microscopy to the central st ...

Optica Publishing Group2025

Hard x-ray grazing-incidence ptychography: large field-of-view nanostructure imaging with ultra-high surface sensitivity

Manuel Guizar Sicairos

The morphology and distribution of nanoscale structures, such as catalytic active nanoparticles and quantum dots on surfaces, have a significant impact on their function. Thus, the capability of monitoring these properties during manufacturing and operatio ...

Optica Publishing Group2024

Small-angle scattering tensor tomography algorithm for robust reconstruction of complex textures

Marianne Liebi, Manuel Guizar Sicairos

The development of small-angle scattering tensor tomography has enabled the study of anisotropic nanostructures in a volume-resolved manner. It is of great value to have reconstruction methods that can handle many different nanostructural symmetries. For s ...

Int Union Crystallography2023

Process-Induced Structures of Injection-Molded High-Density Polyethylene-Combining X-ray Scattering and Finite Element Modeling

Marianne Liebi, Manuel Guizar Sicairos

The success of plastics heavily relies on fast melt processing methods used for large-scale industrial manufacturing, including injection molding. The hierarchical structure of the solid polymer depends on material selection combined with processing condit ...

Amer Chemical Soc2024

Cretaceous Chert-hosted Microfossils Visualized with Synchrotron Ptychographic X-ray Computed Tomography (PXCT)

Manuel Guizar Sicairos

Silicification of microfossils is an important taphonomic process that provides a record of microbial life across a range of environments throughout Earth history. However, questions remain regarding the mechanism(s) by which silica precipitated and preser ...

WILEY2025

X-ray linear dichroic tomography of crystallographic and topological defects

Manuel Guizar Sicairos

The functionality of materials is determined by their composition(1-4) and microstructure, that is, the distribution and orientation of crystalline grains, grain boundaries and the defects within them(5,6). Until now, characterization techniques that map t ...

NATURE PORTFOLIO2024

Towards multiscale X-ray tomographic imaging in membrane science - A perspective

Manuel Guizar Sicairos

Tomographic X-ray imaging techniques offer novel opportunities for studying membranes and membrane processes in 3D on a spatial resolution not seen before. Traditional 2D imaging techniques used to characterise membranes have limitations that can be overco ...

2023

Operando Scanning Small-/Wide-Angle X-ray Scattering for Polymer Electrolyte Fuel Cells: Investigation of Catalyst Layer Saturation and Membrane Hydration- Capabilities and Challenges

Manuel Guizar Sicairos

Polymer electrolyte fuel cells are an essential technology for future local emission-free mobility. One of the critical challenges for thriving commercialization is water management in the cells. We propose small- and wide-angle X-ray scattering as a suita ...

Amer Chemical Soc2024

High-performance 4-nm-resolution X-ray tomography using burst ptychography

Gabriel Aeppli, Manuel Guizar Sicairos

Advances in science, medicine and engineering rely on breakthroughs in imaging, particularly for obtaining multiscale, three-dimensional information from functional systems such as integrated circuits or mammalian brains. Achieving this goal often requires ...

NATURE PORTFOLIO2024

Dynamic change of calcium-rich compartments during coccolithophore biomineralization

Manuel Guizar Sicairos

Coccolithophores are abundant marine phytoplankton that produce biomineralized calcite scales, called coccoliths, which sequester substantial amounts of carbon and play a substantial role in biogeochemical cycles. However, mechanisms underlying the storage ...

American Association for the Advancement of Science (AAAS)2025

Unveiling Challenging Microbial Fossil Biosignatures from Rio Tinto with Micro-to-Nanoscale Chemical and Ultrastructural Imaging

Manuel Guizar Sicairos

Understanding the nature and preservation of microbial traces in extreme environments is crucial for reconstructing Earth's early biosphere and for the search for life on other planets or moons. At Rio Tinto, southwestern Spain, ferric oxide and sulfate de ...

MARY ANN LIEBERT, INC2024

Ptychoscopy: a user friendly experimental design tool for ptychography

Manuel Guizar Sicairos

Electron ptychography is a rapidly growing diffractive imaging technique providing superior image contrast, high resolution, efficient dose usage and versatile imaging conditions. Originally coming from the physical sciences, it has also become a method of ...

2025

Fast Small-angle X-ray Scattering Tensor Tomography: an Outlook Into Future Applications in Life Sciences

Marianne Liebi, Manuel Guizar Sicairos

Small Angle-X-ray Scattering Tensor Tomography (SAS-TT) is a relatively new but powerful technique for studying the multiscale architecture of hierarchical structures particularly relevant to life science applications. Currently, the technique is very dema ...

WILEY-V C H VERLAG GMBH2025

Accelerated deep self-supervised ptycho-laminography for three-dimensional nanoscale imaging of integrated circuits

Manuel Guizar Sicairos, Yi Jiang

Three-dimensional inspection of nanostructures such as integrated circuits is important for security and reliability assurance. Two scanning operations are required: ptychographic to recover the complex transmissivity of the specimen, and rotation of the s ...

2023

Newcomer’s Guide into Optimal Data Acquisition for Electron Ptychography

Manuel Guizar Sicairos

2024